First Lover in the Nighttime? a little bit of bacon?

This is in the drama Psych. I am an English learner and I can't understand why the man suddenly says this.

Juliet and Shawn are couple and they are a kind of policeman. I wonder the bold part. It looks like a joke but I am really confused why Shawn say like that. Please help me.

Juliet: So, why are you so on fire to help Lassiter with this case?

Shawn: It’s not just Lassie, Jules.

Shawn: It’s “Rufus Sewell”. It’s “Sophie B. Hawkins”. I mean, they’re all born in sixty-seven.

Juliet: (sighs) I love me some Sophie “B”.

Shawn: Damn, I wish I was your lover.

Juliet: You are.

Shawn: (gasps) Well, then I guess I must be doing this…

Shawn: (cont’d)… for us. Because you’ll be bumped up to Head Detective when Lassie gets promoted to Chief. Naturally, I’ll get a title bump as well. Something like, uh, First Lover in the Nighttime. Hmm? Maybe a little bit of bacon?

Juliet: You don't know this for sure.

Shawn: Okay, I suppose I don't. We’ll workshop the title. But it's moot. Because you are gonna be in and we're gonna get a hot tub. And I'm gonna buy you a dolphin…

When someone in the US holds a public office (Mayor, Governor, President), their spouse is given the title "First (Gender)." So the president's wife is called "First Lady". Shawn is making a play on words, saying that if Juliet were to receive a promotion, he would be the "First Lover" essentially. And getting "a little bit of bacon" is getting more money.

A rough translation:

Shawn: (cont’d)… for us. Because you’ll be bumped up to Head Detective when Lassie gets promoted to Chief. Naturally, I’ll get a title bump as well. Something like, uh, First Lover in the Nighttime. Hmm? Maybe a little bit of bacon?

Shawn:... Because you [Juliet] will get a promotion. [...] When you do I will too. What will they call me? First Lover in the Nighttime? Or [alternately] your little bit of bacon? [a play on words - police have often been referred to as 'pigs']

It seems to me that Shawn is joking about being Juliet's lover and the possibility of her cooking him bacon in the morning after they sleep together.

When he says "I'll get a title bump... something like First Lover in the Nighttime," he is saying (roughly) "If I help you get promoted, you'll declare me the best lover."

This is not the first time Shawn has used the phrase "lover in the nighttime." In the final episode of season 6, "Santabarbaratown", he jokes about him and Gus being "lovers in the nighttime... (like The Insiders except even more gay)".

When he says "Maybe a little bit of bacon," he is probably referring to the practice of a lover making breakfast for their partner who slept over.

The character Shawn often references bacon. I do not think this is a play on words related to the convention of calling law enforcement "pigs," as suggested by @Icy. Such a play on words would be inconsistent with the reference to being lovers who slept together.

The entire exchange is a phrase soup consisting of pseudo-jargon and confusing metaphors.

All references go to sex and money. The conversation appears to be happening while the couple are having sex. Hence, the "you are (my lover)".

"First Lover in the nighttime" is a coarse reference to the courtesy title normally awarded to spouses of higher government dignitaries.

Some users are suggesting that "bacon" is an indirect reference to policeman: that is totally believable. "Pig" (as a euphemism for police) has been re-appropriated by the very agencies that once found it a slur.

That said, in this case it is a double entendre: given the context, the meaning is more than obvious in its crude and sexual intent.

It is a reference to...

pork (verb) slang

to have sex with a person.

-The On-Line Slang dictionary

In this case it means... "to have sex with a policeman"

On the other hand, we also have the saying to

bring home the bacon

to earn money for a family to live on:

Writers of these types of programs can spend hours discussing nuance after nuance, but conversation during intimate or emotional encounters does not usually achieve a level of "witty repartee".